.container {
  width: 500px;
  height: 500px;
  margin:50px auto;
  background-color:lightblue; 
  
  
  display: grid;
  place-items: center;


}


.box {
  width: 50px;
  height: 50px;
  
  background-color:rgb(163, 245, 163); 
}